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26 | Troubleshooting
9
Troubleshooting
A fault appears on the display of the user interface. The cause
can be a fault on the user interface, in a component, in an
assembly or on the heat source. The instructions belonging to
the affected component, assembly or heat source used and
especially the service manual with detailed fault descriptions
contain additional information on troubleshooting. Many heat
source faults do not appear on the display of the user interface.
They are described in the documents for the heat source used.
Cause or fault description
A11 6004 Solar module wrongly
activated
A12 815
Supply temperature sensor
faulty
(3201 = Heating zone 1;
...
3208 = Heating zone 8)
A31
3101
Zone module has no
...
...
communication to CRCx00 in
A38
3108
the heating zone
(3101 = Heating zone 1;
...
3108 = Heating zone 8)
A31
3201
Zone module detects
...
...
unreasonable status of the
A38
3208
end switch
(3201 = Heating zone 1;
...
3208 = Heating zone 8)
Table 13 Fault table
6 720 821 651 (2017/05)
The last 20 faults that occurred are saved with a time stamp
(fault history, Page 25).
Testing sequence/Cause
–
Check cable connecting supply
temperature sensor and zone module
Check connection between zone
module and supply temperature
sensor
Check the supply temperature sensor
against its data table
Check the voltage to the connection
terminals of the supply temperature
sensor on the zone module against its
data table
Check configuration on the
corresponding controller
Check heating zone assignment on
other controllers
Check if cable for EMS connection is
damaged
Controller defective
Check corresponding zone valve and
end switch for status and defects
Module wrongly configured: switch is
in the wrong position.
Use only original spare parts. Damage
resulting from spare parts not supplied by the
manufacturer is not covered under warranty.
If a fault cannot be corrected, contact the
service technician responsible for your area or
the nearest Bosch office.
Measure
Deactivate solar module in the service
settings ( Bild 12, Seite 16).
If there is a fault, replace cable/sensor
If screws or a plug is loose, rectify the contact
problem
If values do not agree, replace the sensor
If sensor values agree but the voltage values
do not, replace the zone module
Assign the correct heating zone and set
Control type to Room supply, if outdoor
temperature sensor not installed.
Assign the correct heating zones
Replace damaged cable
Replace defective controller
Replace faulty zone valve or end switch
See installation instructions CZM100,
chapter 2.2
CRC200
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